diff --git a/app/Http/Controllers/Single/SingleOrderController.php b/app/Http/Controllers/Single/SingleOrderController.php
index f2eed33..9606976 100644
--- a/app/Http/Controllers/Single/SingleOrderController.php
+++ b/app/Http/Controllers/Single/SingleOrderController.php
@@ -80,12 +80,8 @@ class SingleOrderController extends Controller
             $data['all_price'] = $latestPrice;
             $data['price'] = $basePrice;
             $data['price_id'] = $latestPrice?->id;
-            $feeServiceCharge = Setting::where('key', 'fee_service_charge_percentage')->first();
-            if (! $feeServiceCharge) {
-                throw new UnprocessableEntityHttpException('تنظیمات کارمزد یافت نشد.');
-            }
-            $data['difference'] = (float) (Setting::where('key', 'fee_single')->value('value') ?? config('fee.single', 0));
-            $data['service_charge_percentage'] = (float) $feeServiceCharge->value;
+            $data['difference'] = $config->orderSpreadRial();
+            $data['service_charge_percentage'] = $config->orderServiceChargePercentage();
 
             $fee_free = Setting::where('key', 'fee_free')->where('is_active', true)->value('value');
 
diff --git a/app/Services/ConfigService.php b/app/Services/ConfigService.php
index 0458170..1d76d0e 100644
--- a/app/Services/ConfigService.php
+++ b/app/Services/ConfigService.php
@@ -110,6 +110,35 @@ class ConfigService
         return $sellFee > 0 ? $sellFee : $feeSingle;
     }
 
+    /** اختلاف ریالی سفارش — fee_single، بعد fee_cash (legacy)، بعد config/fee.php */
+    public function orderSpreadRial(): float
+    {
+        $feeSingle = $this->getString('fee_single', '');
+        if ($feeSingle !== '') {
+            return (float) $feeSingle;
+        }
+
+        $legacyCash = $this->getString('fee_cash', '');
+        if ($legacyCash !== '') {
+            return (float) $legacyCash;
+        }
+
+        return (float) config('fee.single', 0);
+    }
+
+    /** درصد کارمزد سفارش — fee_service_charge_percentage، service_charge_percentage، config/fee.php */
+    public function orderServiceChargePercentage(): float
+    {
+        foreach (['fee_service_charge_percentage', 'service_charge_percentage'] as $key) {
+            $raw = $this->getString($key, '');
+            if ($raw !== '') {
+                return (float) $raw;
+            }
+        }
+
+        return (float) config('fee.service_charge_percentage', 0);
+    }
+
     /**
      * sell / buy / price_last — یک منبع حقیقت برای lastPrice و buildFromDatabase.
      *